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A Langman

Member Since 24 Jul 2005
Offline Last Active Oct 12 2005 11:15 PM

Topics I've Started

I'm being SPAMMED from this site

12 October 2005 - 11:15 PM

Hi All,

I have just been spammed with a personal message from this site! ;) Please prevent this.

This is the message that I received:

"Hi my friend,do you want find some chance to earn dollars? I can tell you that I can help
you.I currently do the business of whloesale dvd9,and it is well-made ,the quality is perfect.But it not expensive,it is only $3 per disk.if you instrested about this please
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thanks very much."

It was sent by


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Member No.: 4,976
Joined: 24-Aug 05


Adam L

Lens size, magnification and viewangle?

24 July 2005 - 09:30 PM

Hi All,

I'm a bit confused :lol: . When I'm looking for some additional lenses (both for above water and under). Some manufacturers quote a 16mm wide-angle lens, while others quote 0.5x magnification. How do I compare the two?

Now this is my guess, someone please correct me here....

Ok, most cameras used to be 35mm. A bigger number meant getting closer or magnifying the object (ie telephoto or macro). A smaller number meant getting further away (ie wide angle/fisheye). Now, say you have a 35mm and you get a 16mm wide-angle lens, what is the magnification? Is it simply 16/35=0.457? If so, then I can just apply that to my digital camera and everything is solved :)

For example, my digital camera has the 35mm equivalent of a 27-110 mm lens. So if I have a 0.45x WA then do I end up with a 12.5-49.5mm lens? So what does this mean? What is my view angle? Is it possible to calculate the viewing angle as well? Again, some people quote a size, while others quote view angle.

Last, how do all these numbers change when you put the camera in water!!!!! :D

Sorry for all the questions!


Adam L